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power.c revision 1.17 
      1 /*	$NetBSD: power.c,v 1.17 2005/11/16 00:49:03 uwe Exp $ */
      2 
      3 /*
      4  * Copyright (c) 1996
      5  *	The President and Fellows of Harvard College. All rights reserved.
      6  *
      7  * All advertising materials mentioning features or use of this software
      8  * must display the following acknowledgement:
      9  *	This product includes software developed by Aaron Brown and
     10  *	Harvard University.
     11  *
     12  * Redistribution and use in source and binary forms, with or without
     13  * modification, are permitted provided that the following conditions
     14  * are met:
     15  *
     16  * 1. Redistributions of source code must retain the above copyright
     17  *    notice, this list of conditions and the following disclaimer.
     18  * 2. Redistributions in binary form must reproduce the above copyright
     19  *    notice, this list of conditions and the following disclaimer in the
     20  *    documentation and/or other materials provided with the distribution.
     21  * 3. All advertising materials mentioning features or use of this software
     22  *    must display the following acknowledgement:
     23  *	This product includes software developed by Harvard University
     24  *	and its contributors.
     25  * 4. Neither the name of the University nor the names of its contributors
     26  *    may be used to endorse or promote products derived from this software
     27  *    without specific prior written permission.
     28  *
     29  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     30  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     31  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     32  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     33  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     34  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     35  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     36  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     37  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     38  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     39  * SUCH DAMAGE.
     40  */
     41 
     42 #include <sys/cdefs.h>
     43 __KERNEL_RCSID(0, "$NetBSD: power.c,v 1.17 2005/11/16 00:49:03 uwe Exp $");
     44 
     45 #include <sys/param.h>
     46 #include <sys/device.h>
     47 #include <sys/kernel.h>
     48 #include <sys/systm.h>
     49 
     50 #include <machine/autoconf.h>
     51 
     52 #include <sparc/dev/power.h>
     53 
     54 static int powermatch(struct device *, struct cfdata *, void *);
     55 static void powerattach(struct device *, struct device *, void *);
     56 
     57 CFATTACH_DECL(power, sizeof(struct device),
     58     powermatch, powerattach, NULL, NULL);
     59 
     60 /*
     61  * This is the driver for the "power" register available on some Sun4m
     62  * machines. This allows the machine to remove power automatically when
     63  * shutdown or halted or whatever.
     64  */
     65 
     66 static int
     67 powermatch(struct device *parent, struct cfdata *cf, void *aux)
     68 {
     69 	union obio_attach_args *uoba = aux;
     70 	struct sbus_attach_args *sa = &uoba->uoba_sbus;
     71 
     72 	if (uoba->uoba_isobio4 != 0)
     73 		return (0);
     74 
     75 	return (strcmp("power", sa->sa_name) == 0);
     76 }
     77 
     78 /* ARGSUSED */
     79 static void
     80 powerattach(struct device *parent, struct device *self, void *aux)
     81 {
     82 	union obio_attach_args *uoba = aux;
     83 	struct sbus_attach_args *sa = &uoba->uoba_sbus;
     84 	bus_space_handle_t bh;
     85 
     86 	/* Map the power configuration register. */
     87 	if (sbus_bus_map(sa->sa_bustag,
     88 			 sa->sa_slot, sa->sa_offset, sizeof(uint8_t),
     89 			 BUS_SPACE_MAP_LINEAR, &bh) != 0) {
     90 		printf("%s: cannot map register\n", self->dv_xname);
     91 		return;
     92 	}
     93 	power_reg = (volatile uint8_t *)bh;
     94 
     95 	printf("\n");
     96 }
     97 
     98 void
     99 powerdown(void)
    100 {
    101 	/* Only try if the power node was attached. */
    102 	if (power_reg != NULL)
    103 		*POWER_REG |= POWER_OFF;
    104 
    105 	/*
    106 	 * don't return too quickly; the PROMs on some sparcs
    107 	 * report the powerdown as failed if we do.
    108 	 */
    109 	DELAY(1000000);
    110 }
    111